الفهرس 
IntroductionOnly 14 pages are availabe for public view
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Abstract
The first part of this study (in ovo L-carnitine injection and incubation of fertilized eggs) was undertaken at a local commercial hatchery and the second part (feeding trial for the hatched chicks) was performed at the Poultry Research Unit, Center of Agricultural Researches and Experiments, belonging to Faculty of Agriculture, Mansoura University, Egypt. The aim of the present study was to investigate the effect of in ovo injection of L-carnitine at different incubational ages on hatchability of broiler breeders and subsequent performance of their progeny. The most important results obtained in the present study can be summarized as follows: Hatchling weight was not affected by either in ovo injection of L-carnitine or injection day during the incubation period. Hatchability of fertile eggs was not affected by injected dose of L-carnitine, regardless of the effect of injection day, but hatchability of fertile eggs was significantly higher when eggs were injected with L-carnitine on day 14 of incubation than those of eggs injected on days 16 or 18 of incubation. L-Carnitine dose by injection day interaction was significant on hatchability of fertile eggs but insignificant on hatch weight of chicks. No mortality occurred during the experimental period (0-7 weeks of age). CONCLUSION : Based on the obtained results under the conditions of this study, it is concluded that in ovo L-carnitine injection is beneficial for hatchability when is applied on day 14 of incubation while its injection within the fertile eggs at level of 8.0 mg/100 μL on day 16 of incubation is advantageous to subsequent performance.